What Brazil’s Marine Biofuels Regulation Means for Investors

On 14 July 2026, a bunker barge named Dona Isa pulled alongside a deep-sea container ship at the Port of Santos and pumped roughly 635,000 litres of anhydrous ethanol into its tanks. It was the first time an ocean-going vessel had been fuelled with ethanol in Latin America.

The milestone was real. The rulebook behind it was not finished.

That gap is the story. Brazil, the world’s largest ethanol exporter and a heavyweight biofuel producer, is redrafting the regulation that governs what ships can burn in its ports, and the outcome will shape whether that Santos moment becomes routine or stays a one-off.

Brazil’s marine biofuels regulation sits at a rare decision point. The public consultation on ANP’s draft closed on 10 September 2026 with 357 submissions, a public hearing followed on 23 September 2026, and a final regulation is expected before the end of the year.

Here is what that decision will actually determine: whether a blending mandate arrives as a near-term demand catalyst for Brazilian biofuel producers, or whether ethanol stays locked in an experimental tier while global frameworks catch up. Getting that distinction right is the entire investment case.

What ANP’s draft regulation actually contains, and what it leaves out

The draft is a revision of Resolution ANP nº 903/2022, the framework that currently sets specifications for marine diesel and marine fuel oil sold in Brazil. Read from the inside, its architecture reveals a clear hierarchy among alternative fuels.

Biodiesel, including neat B100, hydrotreated vegetable oil (HVO, a renewable diesel made by treating vegetable oils or animal fats with hydrogen), and gas-to-liquids (GTL) fuel would all be marketable without special authorisation, provided they meet ANP specifications. Suppliers could offer blends up to 100% biodiesel to vessel operators without a separate approval process.

Ethanol does not get that treatment. Under the draft it remains subject to special, case-by-case authorisation, a fuel that industry participants describe as “only partially addressed.”

That asymmetry is not incidental. ANP’s stated rationale is alignment with ISO 8217:2024, the marine fuel specification the IMO recognises, and the fact that the International Maritime Organization (IMO) has not yet issued specific guidelines for ethanol bunkering operations.

The regulator is choosing to move at the pace of international standards. That is a principled position, but a consequential one, because it means ethanol’s upside in this regulation depends entirely on whether ANP accepts industry arguments that gaps in global rules should not dictate domestic policy.

Scale of engagement: ANP received 357 submissions during the 45-day consultation window that ran from late July to 10 September 2026. That volume signals how much commercial weight the industry is placing on this single revision.

The draft would also create national specifications and storage standards covering marine biodiesel, HVO, ethanol, and GTL. For now, only Petrobras and Raízen hold authorisation to sell marine biodiesel blends, with the existing cap set at 24%.

For biodiesel producers and HVO suppliers, the draft is already a win: routine market access. For ethanol, everything still hinges on the lobbying that came next.

Brazil’s broader marine fuel demand dynamics have already been disrupted in 2026 by the 50% MGO export tax, which compressed conventional bunker volumes at Santos and other major ports, creating both a commercial opening and a pricing context for alternative fuels entering the market.

Two industry proposals that could reshape the regulation before it is finalised

The draft as written is permissive, not demanding. It allows biofuels; it does not require them. Two industry proposals, pushed by different corners of the sector, would change that, and they are complementary rather than competing.

Biodiesel producers’ association Ubrabio wants a phased blending mandate written into a draft that currently contains none. The proposed schedule:

1. B15 (15% biodiesel blend) in marine gasoil from July 2027, generating roughly 230 million litres per year of additional demand
2. B20 (20% blend) from January 2028
3. B24 (24% blend) from July 2028, lifting additional demand to roughly 368 million litres per year

Those demand figures come from Brazilian bioenergy firm Binatural. The 230-to-368 million litre range is the clearest near-term market signal in this entire regulatory process, because it quantifies the new biofuel volume a mandate would unlock. Investors in Brazilian biodiesel capacity should treat it as a credible floor for what adoption at scale could mean.

Ethanol: from experimental authorisation to routine supply

The second proposal comes from bunker association Abrabunker and ethanol producers’ association Unica, arguing jointly that ethanol deserves a dedicated marine standard rather than perpetual case-by-case permits.

Their proposed mechanism is specific: apply Resolution 907, Brazil’s existing ethanol specification for road transport covering both anhydrous and hydrous grades, to marine use. That would remove the special-approval barrier that currently keeps ethanol experimental.

The supporting evidence is already on the water. The Santos trial saw Bunker One supply 500 tonnes (approximately 635,000 litres) of anhydrous ethanol to the CMA CGM Iron, a 13,000 TEU tri-fuel container ship, on 14 July 2026, using its barge Dona Isa with ethanol sourced from Copersucar.

Actors including Ubrabio, Abrabunker, Unica, Binatural, Petrobras, and Raízen all pressed their positions at the September hearing. The supply chain clearly exists. What it lacks is routine access, and that is precisely what these two proposals would grant. Together, they represent the maximum biofuel outcome the regulation could deliver, and ANP’s response will set the commercial ceiling for the next phase of demand.

Vale’s work on ethanol-powered shipping demonstrates that the operational case for large-vessel ethanol adoption is already being built by major Brazilian commodity producers, providing further evidence that supply chain readiness precedes the regulatory framework rather than following it.

Why ethanol faces a structural ceiling beyond Brazil’s borders

The biofuel advocates at the ANP hearing made a strong case for ethanol at home. They did not fully resolve the problem waiting for it abroad.

The IMO has issued interim guidelines for vessels running on methanol or ethanol under MSC.1/Circ.1621, integrated into the IGF Code (the international code of safety for ships using gases or low-flashpoint fuels). Those cover containment, fire protection, and operational procedures at the ship level. What the IMO has not issued is specific guidance for ethanol bunkering operations, and that missing piece is exactly why ANP holds ethanol at experimental status.

Here is the sharper problem. Even where ethanol’s climate credentials are recognised, they do not currently earn commercial reward in the most demanding regional regime.

What the IMO framework currently provides:

• Vessel-level safety guidelines for methanol and ethanol fuels
• A favourable lifecycle greenhouse gas (GHG) factor for ethanol

What it does not provide:

• Specific bunkering operation guidelines
• Compliance credit under the EU’s FuelEU Maritime regulation

The gap between lifecycle recognition and compliance credit

The distinction matters more than it first appears. According to industry estimates cited by engine manufacturer WinGD, Brazilian second-growth corn ethanol carries an IMO lifecycle GHG factor of 20.8 gCO2eq/MJ, described as more than four times lower than very low sulphur fuel oil (VLSFO).

WinGD’s finding: Ships burning ethanol into European ports currently earn no credit under FuelEU Maritime, despite ethanol’s favourable IMO lifecycle GHG factor. The favourable emissions profile does not translate into regulatory incentive under the current EU regime.

That is a design flaw in global regulation, not a flaw in ethanol’s emissions profile. FuelEU Maritime rewards fuels through its own compliance accounting, and ethanol does not yet register in it.

For investors, this is the single most important constraint on ethanol’s near-term adoption by international fleets. A Brazilian domestic mandate, if adopted, would mainly drive demand from vessels trading within or regularly calling at Brazilian ports, not from the global deep-sea fleet optimising against EU compliance. Rotterdam has run one of the world’s first ethanol bunkerings, but as a pioneering pilot, not routine practice, and no major shipping nation has yet enacted a statutory marine biofuel blending mandate. The demand uplift from Brazil’s move is real, but bounded.

The FuelEU Maritime regulation sets greenhouse gas intensity targets for energy used by ships calling at EU ports, but its compliance accounting framework does not currently recognise ethanol in a way that rewards vessels burning it, leaving a structural mismatch between ethanol’s favourable IMO lifecycle emissions factor and the incentives that influence route and fuel decisions for global deep-sea fleets.

Brazil’s production base as the strategic underpinning of the entire regulatory push

Strip away the regulatory detail and one fact explains why the lobbying is so organised: Brazil has the volume, and everyone in the room knows it.

According to energy research firm EPE, Brazil’s ethanol production is projected at 39.8 billion litres in 2026 (equivalent to 686,959 barrels per day), a 6.4% rise year-on-year. That scale is the structural reason this regulatory moment carries global weight rather than purely domestic significance.

Production context: EPE forecasts Brazilian ethanol output at 39.8 billion litres in 2026, rising roughly 20% to around 50 billion litres by 2035. The supply question is essentially answered.

Put the demand numbers against that base:

• 2026 output: 39.8 billion litres
• 2035 forecast: approximately 50 billion litres
• Ubrabio B24 mandate demand: 368 million litres per year, less than 1% of projected 2026 output

The math is the point. Even the most ambitious blending scenario represents a marginal call on Brazil’s supply base. The constraint on adoption is entirely regulatory and commercial, not physical, and investors should frame their analysis accordingly.

That cuts both ways. For investors in Brazilian bioenergy, the production scale confirms supply is not the binding constraint. But it also means the demand uplift from a marine mandate, while meaningful in absolute litres, stays modest against the total production base. Brazil is uniquely positioned among major energy producers to mandate biofuel blending in bunkers without risking a shortfall, and that is exactly what makes its regulatory choice consequential.

What the ANP decision will actually determine for investors

The evidence points to three plausible outcomes when ANP finalises the regulation before year-end 2026:

• Full adoption: Biodiesel blending mandate plus ethanol mainstreamed via Resolution 907. The maximum demand outcome, unlocking Binatural’s 230-to-368 million litre range and moving ethanol from experimental to routine.
• Partial adoption: One measure but not the other, most likely a blending mandate without ethanol mainstreaming. Still a material demand event for biodiesel and a moderate positive for authorised incumbents.
• Status quo: Close to the current draft, meaning no mandate and ethanol held experimental. Meaningful demand pushed into a post-2027 advocacy cycle.

Even the partial scenario matters. A blending mandate without ethanol mainstreaming would be a direct demand catalyst for Petrobras and Raízen, who currently hold the only two authorisations to sell marine biodiesel blends, meaning the benefit concentrates first among incumbents.

Petrobras production capacity reaching record levels in 2026 creates an internal tension within Brazil’s energy policy: the same company positioned to be a first-mover beneficiary of marine biodiesel authorisations is simultaneously the dominant actor in conventional fossil fuel output, and its commercial calculus on biofuel mandate support reflects that dual role.

The ethanol scenario is the higher-magnitude but longer-timeline outcome. It depends on domestic regulatory action and, eventually, evolution in both IMO and EU frameworks, and the Santos and Rotterdam pilots already show that operational readiness is not the limiting factor.

Treat the year-end decision as a binary near-term signal. A blending mandate is a direct demand catalyst for authorised biodiesel sellers. Retention of the current draft without mandate language pushes the meaningful demand event well past 2027 and into the next advocacy cycle. That distinction sets the investment timeline across the bioenergy value chain.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions.

Brazil’s regulatory bet and the longer arc of maritime decarbonisation

The tension at the centre of this story is straightforward once the pieces are laid out. Brazil has the supply, the operational precedents, and an organised industry pushing for demand. Those ingredients could make it a genuine global hub for marine biofuels.

The ceiling on that role is not set in Brasília. It is set by the IMO and the EU, whose frameworks are evolving on a multi-year timeline that no domestic mandate can accelerate on its own.

Legal commentary from Mayer Brown frames Brazil’s move as significant precisely because it operationalises ethanol through domestic rules ahead of the IMO, positioning the country as a potential norm-setter rather than a follower. Even under experimental authorisation, that is a signal worth tracking.

Maritime decarbonisation momentum is building across multiple geographies simultaneously, with China’s green ship fuel agreements adding sovereign weight to the commercial pilots already underway in Brazil and Europe, making the regulatory gaps that ANP is now resolving part of a broader race to establish dominant bunkering positions.

For investors, the forward-looking work is to separate two regulatory tracks. Watch the ANP decision before year-end 2026 for the biodiesel blending mandate signal, the near-term catalyst. Watch IMO bunkering guidelines and FuelEU Maritime evolution for the ethanol timeline, the longer structural shift.

The 50 billion litre production forecast for 2035 is the argument for patience in this trade. Whether the Brazil marine biofuels story is a 2027 demand event or a 2030-plus structural change depends on which of those tracks moves first, and that verdict belongs to ANP and to time.

Financial projections are subject to market conditions and various risk factors, and past performance does not guarantee future results. Forward-looking regulatory outcomes described here are speculative and subject to change based on policy developments.